Enhance "box" and "column" mode formatting in the CLI to better deal with

double-wide characters.

FossilOrigin-Name: b0de22ed0abf2ea5d269f191c884d7b2be167a2ed27018c25aaa0ea238cd621a

test/dblwidth-a.sql

@@ -0,0 +1,20 @@
+/*
+** Run this script using "sqlite3" to confirm that the command-line
+** shell properly handles the output of double-width characters.
+**
+** https://sqlite.org/forum/forumpost/008ac80276
+*/
+.mode box
+CREATE TABLE data(word TEXT, description TEXT);
+INSERT INTO data VALUES('〈οὐκέτι〉','Greek without dblwidth <...>');
+.print .mode box
+SELECT * FROM data;
+.mode table
+.print .mode table
+SELECT * FROM data;
+.mode qbox
+.print .mode qbox
+SELECT * FROM data;
+.mode column
+.print .mode column
+SELECT * FROM data;